Title: Full factorial experimental design of Ni(II) removal from industrial wastewater by adsorption

Authors: Fulya Aydın Temel; Esin Avcı; Nurdan Gamze Turan

Addresses: Department of Environmental Engineering, Giresun University, Giresun, Turkey ' Department of Statistics, Giresun University, Giresun, Turkey ' Department of Environmental Engineering, Ondokuz Mayıs University, Samsun, Turkey

Abstract: The removal of Ni(II) from industrial wastewater was investigated using adsorption process by gyttja. Full factorial experimental design containing two levels and four factors (2⁴) was performed to improve Ni(II) removal by reducing the number of experiments and to optimise the experimental conditions for Ni(II) adsorption process. Ni(II) adsorption performance of gyttja was examined as a function of pH, contact time, temperature, and adsorbent concentration. The maximum Ni(II) removal was found as 36% at pH 3, with 25 g L⁻¹adsorbent concentration, for 60 min contact time at 50°C with initial Ni(II) concentration of 3,404 mg L⁻¹. The maximum adsorption capacity of gyttja was found as 6.80 mg g⁻¹ at pH 6, adsorbent concentration of 25 g L⁻¹, contact time of 60 min and temperature of 20°C. The predicted values of the model were found to be in agreement with experimental data. The present study may provide a theoretical basis for further research to treat wastewater with novel adsorbents.

Keywords: adsorption; gyttja; optimisation; factorial design; Ni(II); industrial wastewater.

DOI: 10.1504/IJGW.2018.095388

International Journal of Global Warming, 2018 Vol.16 No.3, pp.299 - 319

Received: 21 Nov 2017
Accepted: 31 Mar 2018
Published online: 03 Oct 2018 *

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